Hoisting apparatus.



' 5. PATENTED FEB. 4, 1908.

No 878,33 A. P. BUYER.

HOISTING APPARATUS.

APPLICATION FILED SEPT.18. 1907.

2 SHEETS-$HEET 1.

anvenroz dumm No. 878,335. PATENTED FEB. 4, 1908. I A. P. BOYER.

HOISTING APPARATUS.

APPLICATION FILED SEPT.18, 1907.

2 SHEETS-SHEET 2.

Wat" use:

UNITED STATES PATENT OFFICE.

ALLEN. P. BOYER, OF GOSHEN, INDIANA.

I-IOISTING APPARATUS.

Specification of Letters Patent.

Patented Feb. 4, 1908.

Application filed September 18, 1907- Serial No. 393.440.

is adapted and desirable for use in any relation where it is desired tolock a load in an elevated position.

The main object of this invention is to provide an improved hoistingapparatus-adapted to automatically lock a load in any position, that is,at any point in its elevation.

Another object is to provide a structure embodying the above advantageswhich permits the lowering of the load after the same has been hoisted.

Further objects, and objects relating to structural details, willdefinitely appear from the detailed description to follow.

. I accomplish the objects of my invention by the devices and meansdescribed in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearlyillustrated in the accompanying drawing, forming a part of thisspecification, in which,

Figure 1- 1s a perspective vlew of a structure embodying the features ofmv invention; Fig. 2 is a detail side elevation thereof, the carriagebeing broken'away; Fig. 3 is a detail view with one side of the framebroken away, the clutch member being shown in its engaging position bydotted lines, the pivots for the clutch supporting link and the pulleyspindle being shown in section; Fig. 4 is a detail vertical sectiontaken on a line corresponding to line 44 of Fig. 3; Fig. 5 is anenlarged detail section taken on a line corresponding to line 5 5 ofFig. l, of the clutch member and supporting link therefor; and Fig. 6 isan enlarged detail taken on a line corresponding to line 6-6 of Fig. 5

, showing the relation of the clutch actuating pawl and thepulley.

'In the drawing, the sectional views are taken looking in the directionof the little arrows at the ends of the section lines, and similarreference characters refer to similar parts throughout the severalviews.

Referring to the drawing, the structure illustrated is provided with acarriage as 1. The carriage ,1 is provided with wheels 2 adapted totravel on a suitable track. The frame is preferably madeup of sidepieces 3 and a bottom piece 4, suspended and secured to the carriage bymeans of the bolts 5, the side pieces of the frame being connected bythe bolt 6.

The pulley 7 is. journaled on a-suitable spindle 8 preferably arrangedlongitudinally of the carriage so that the pulley is transverse-thereof,as is illustrated in the drawing. The pulley is providedwith'laterally-projecting teeth or projections 9 arranged at suitableintervals about the same. A clutch member 10 is pivotally mounted on theupper ends of the links 11 by means of the pivot bolt 12. The links 11are mounted'on the pivots 13 which are preferably arranged in advance ofthe spindle 8 for the pulley. The inner or gripping face of the clutchmember 10 is preferably curved to correspond to the pulley and coactstherewith in gripping a rope. The supporting links for the clutch memberor clamping jaws 10 are so arranged that, when they are swungdownwardly, the clutch member is forced or carried inwardly against therope on the pulley, clamping the same thereon.

One of the links is slotted at 14 to receive the pin 15 on the clutchmember, thereby limiting the pivotal movement of the clutch member onthe links. This arrangement allows the clutch member to adjust itself tothe rope and avoids the necessity of the ac curate fitting andarrangement of the parts. The clutch member is preferably pivoted sothat its forward end over-balances the rear end.

On the inner face of one of the links 11 is a rigid pawl or tooth 16adapted, when the links are swung slightly downward, to be engaged bythe teeth 9 on the pulley, so that the rearward movement of the pulleydraws the clamping member down into its clamping position; see thedotted lines in Fig. 3. This pawl is preferably V-shaped, its engagingfaces being preferably curved. The supporting-links for the clutchmember are normally held in their elevated position by the sliding dog17 having an arm 18 which engages the downwardly-projecting arm 19 onone of the links.

When the links are in their elevated position, the pulley is free torevolve in either direction without acting thereon. When, however, thelinks are released by the dog 17 they drop downward of their own weight,so that the pawl thereon is in position to be engaged by the teeth onthe pulley. The rearward movement of the pulley, as explained, draws theclutch member down onto the rope, thereby clamping the same. On theforward movement of the pulley the teeth on the pulley engage the underside of the pawl passing under the same to lift the clutch free from therope. The trip dog 17 is arranged in a suitable way 20 provided thereforin the side of the frame. The trip dog is held normally upward by thespring 21 which engages the hook 22 on the dog. This spring ispreferably carried by the wheel-like support 23 provided therefor on theside of the frame; see Figs. 1 and 2. In order that the clutch may beautomatically actuated by the load, I provide a trip 24, which isadapted to engage the arm 25 on the trip dog. The trip 24 is heldnormally upward by springs 26. The swivel 27 is connected to the tripmember. The hoisting rope 28 is connected to the trip member 24 by meansof the'swivel, and, after passing through the running pulleys 29, isbrought over the pulley 7, The trip member 24 is mounted uponthevertical frame bolts 5 to slide thereon so that it is properly guided.Thus arranged, the greater the load the greater the clamping force ofthe clutch. The spring 21- is preferably not strong enough to releasethe clutch member or raise it from its clutching position until the sameis released by the slight forward movement of the pulley, which liftsthe clutch from the rope, the spring being of sufficient strength. tocounterbalance the weight of the clutch and its support and hold it inits elevated position. This is an advantage, as it prevents thereleasing of the hoisting rope after the load is released, which. is ofgreat advantage, particularly in hay-carriers, as the sling or fork isheld in its elevated position during the returnof the carrier to itshoisting position, where, by a slight pull on the hoisting rope or onthe trip rope 30, the clutch is released so that the sling or fork maybe readily lowered.

It is sometimes desirable to release the clutch so that a load may berelowered.

- This may be done by the trip rope 30, which is preferably connected tothe top of the clutch. A spring 31 is preferably provided for sustainingthe weight of the trip rope.

By arranging the parts as I have illustrated and described, I provide adevice by which the load is automatically locked in any position, theweight of the load serving to actuate the clutch. The load may belowered as desired. The pulley forms one of the clutch members, therebysimplifying the con struction. The rope is clamped so that the wearthereon is reduced to a minimum.

I have illustrated and described my improved hoisting apparatus indetail in the form preferred by me on. account of the structuralsimplicity and convenience in operation. I am, however, aware that it iscapable of considerable variation. in structural details withoutdeparting from my invention, and I desire to be understood as claiming'the same specifically, as ilh'istrated, as well as broadly.

Having thus described-my invention, what I claim as new and desire tosecure by Letters Patent is:

1. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein, pivoted on said frame, the pivot for saidlink being arranged in front of the journal for said pulley; a clutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said. slot in said link whereby the pivotalmovement of said clutch member 18 limited; a dog adapted to hold saidlink in its elevated posltion; a return spring therefor; a down wardlyand forwardly-projecting v-sha wd fixed pawl or tooth on said linkadapted to engage the teeth on said pulley when said link is released bysaid dog; a hoisting rope; a trip member for said dog to which said ropeis connected; and a return spring for said trip member.

2. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged infront of the journal for said pulley; a clutch member adapted to coactwith the pulley in gripping a rope, pivotally mounted on said link; adog adapted to hold said link in its elevated position; a return springtherefor a downwardly and forward lyprojecting V-shaped pawl or tooth onsaid link adapted to engage the teeth on said pulley when said link isreleased by said dog: a hoisting rope; a trip member for said dog towhich the said rope is connected; and a return spring for said tripmember.

3. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of the 1 journal for said pulley; a clutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said slot in said link whereby the pivotaln'iovement of said clutch member is limited; a dog adapted to hold saidlink in its elevated position; a return spring therefor; a pawl on saidlink adapted to engage the teeth on said pulley when said link isreleased by said dog; I

a hoisting rope; a trip member for said dog to which the said rope isconnected; and a return spring for said trip member.

4. The combination with a frame, of a pulley having teeth thereon; alink ivoted on said frame, the pivot for said lin; being arranged infront of the journal for said pulley; a clutch member adapted to coactwith the pulley in gripping a rope pivotally mounted on said link; a dogadapted to hold said link in its elevated position; a return springtherefor; a pawl on said link adapted to engage the teeth on said pulleywhen said link is released by said dog; a hoisting rope;

a trip member for said dog to which the said rope is connected; and areturn spring for sald trip member.

5. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of the journal for said pulley; aclutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said slot in said link whereby the pivotalmovement of said clutch member is limited; a dog adapted to hold saidlink in its elevated position; a downwardly and forwardly-projecting V-shaped fixed pawl or tooth on said link adapted to engage the teeth onsaid pulley when said link is released by said dog; a hoisting rope; anda trip member for said dog to which the said rope is connected.

6. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged. infront of the journal for said pulley; a clutch member adapted to coactwith the pulley in gripping a rope pivotally mounted on said link; a dogadapted to hold said link in its elevated position; a downwardly andforwardly-projecting V-shaped fixed pawl or tooth on said link adaptedto engage the teeth on said pulley when said link is released by saiddog; a hoisting rope; and a trip member for said dog to which the saidrope is'connected.

7. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of thejournal for said pulley; a clutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said slot in said link whereby the pivotal movement of said clutch member is limited; a dog adapted to hold said linkin its elevated position; a pawl on said link adapted to engage theteeth on said pulley when said link is released by said dog; a hoistingrope;

and a trip member for said dog to which the said rope is connected.

8. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being ar ranged infront of the journal for said pulley; a clutch member adapted to coactwith the pulley in gripping a rope, pivotally mounted on said links; adog adapted to hold said link in its elevated position; a pawl on saidlink adapted to engage the teethon said pulley when said link isreleased by said dog; a hoisting rope; and trip member for said dog towhich the said rope is connected.

9. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of the journal for said pulley; a clutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said slot in said link whereby the pivotalmovevated position arranged to be tripped by the weight of the load onthe hoisting rope.

10. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged infront of the journal for said pulley; a clutch member having a curvedengaging face adapted to coact with the pulley in gripping a ropepivotally mounted on said link; a downwardly and forwardly-projecting Vshaped fiXed pawl or tooth on said link adapted to engage the teeth onsaid pulley when said link is released by said dog; and a dog adapted tohold said link in its elevated position arranged to be tripped by theweight of the load on the hoisting rope.

11. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of the journal for said pulley; a clutchmember adapted to coact with the pulley in gripping a rope, pivotallymounted on said link; a pin on said clutch member adapted to engage saidslot in said link whereby the pivotal movement of said clutch member islimited; a downwardly and forwardly-proj ecting V-shaped fixed pawl ortooth on said link adapted to engage the teeth on said pulley when saidlink is released by said dog; and a dog adapted to hold said link in itselevated position arranged to be tripped by the weight of the load onthe hoisting rope.

12. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged infront of the journal for said pulley; a clutch member adapted to coactwith the pulley in gripping a rope, pivotally mounted on said link; adownwardly and forwardly-projecting V-shaped fixed pawl or tooth on saidlink adapted to engage the teeth on said pulley when said link isreleased by said dog; and a dog adapted to hold said link in itselevated position arranged to be tripped by the weight of the load onthe hoisting rope.

13. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame,- the pivotv for saidlink being arranged in front of the journal for said pulley; a clutchmember having a curved engaging face adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a pin on said clutchmember adapted to engage said slot in said. link whereby the pivotalmovement of said clutch member is limited; a pawl on said link adaptedto engage the teeth on said pulley when said. link is released by saiddog; and a dog adapted to hold said link in its elevated positionarranged to be tripped. by the weight of the load on the hoisting rope.

14. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged infront of the journal for said pulley; a clutch member having a curvedengaging face adapted to coact with the pulley in gripping a ropepivotally mounted on said link; a pawl on said. link adapted to engagethe teeth on said pulley when said. link is released; and a dog adaptedto hold said link in its elevated position arranged to be tripped by theweight of the load on the hoisting ropel 15. The combination with aframe of a pulley having teeth thereon; a link having a slot thereinpivoted on said frame, the pivot for said link being arranged in frontof the journal for said pulley; a clutch member adapted to coact withthe pulley in gripping a rope pivotally mounted on said link; a pin onsaid clutch member adapted to engage said slot in said link whereby thepivotal movement of said clutch member is limited;

a pawl on said link adapted to engage the teeth on said pulley when saidlink is released; and a dog adapted to hold said link in its elevatedposition arranged to be tripped by the weight of the load on thehoisting r0 e.

f6. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said link being arranged infront of the ournal for said pulley; a clutch member adapted to coactwith the pulley in gripping of a rope, pivotally mounted on said. link;a pawl on said link adapted to engage the teeth on said pulley when saidlink is released; and a dog adapted to hold said link in its elevatedposition arranged. to be tripped by the weight of the load. on thehoisting rope.

17. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame, the pivot for said. link being arranged infront of the journal for said. pulley; 'a clutch member adapted to coactwith the pulley in gripping a rope, mounted on said link; a downwardlyand forwardly-projecting ti-shaped fixed pawl or tooth on said linkadapted to engage the teeth on said pulley when said. link is released;and a dog adapted to hold said link in its elevated position arranged tobe tripped by the weight of the load on the hoisting rope.

18. The combination with a frame, of a pulley having teeth thereon; alink having a slot therein pivoted on said frame, the pivot for saidlink being arranged in front of the journal for said pulley; a clutchmember adapted to coact with the pulley in gripping a rope, mounted onsaid link; a pin on said clutch member adapted to engage said slot insaid link whereby the pivotal movement of said clutch member is limited;a pawl on said link adapted to engage the teeth on said pulley when saidlink is released; and a dog adapted to hold said link in its elevatedposition arranged to be tripped by the weight of load on the hoistingrope.

19. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a dog adapted to holdsaid link normally upward a trip for said dog adapted to be actuated bythe weight of the load; and a forwardlyprojeeting ti-shaped fixed pawlor tooth on said link adapted to engage the teeth on said pulley whenthe link is released by said dog whereby said clutch member is drawninto its clamping position by the rearward revolution of the pulley andlifted out of its clamping position by the forward revolution of thepulley.

20. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope pivotally mounted on said link; a dog adapted to holdsaid link normally upward; a trip for said dog adapted to be actuated bythe weight of the load and a pawl on said link adapted to engage theteeth on said pulley when the link is released by said dog whereby saidclutch member is drawn into its clamping position by the rearwardrevolution of the pulley and lifted out of its clamping position. by theforward revolution of the pulley.

21. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted. on said link; adog adapted to hold said linknormally upward; a trip for said dog adapted tobe actuated by the weightof the load; and a forwardly-projecting V-shaped fixed pawl or tooth onsaid link adapted to engage the teeth on said pulley when the link isreleased by said dog whereby said clutch member is drawn into itsclamping position by the rearward revolution of the pulley and liftedout of its clamping osition by the forward revolution of the pulley.

22. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said link; a dog adapted to hold said linknormally upward; a trip for said dog adapted to be actuated by theweight of the load; and a pawl on said link adapted to engage the teethon said pulley when the link is released by said dog whereby said clutchmember is drawn into its clamping position by the rearward revolution ofthe pulley and lifted out of its clamping osition by the forwardrevolution of the pu ey.

23. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a dog adapted to holdsaid link normally upward; a trip for said dog; and aforwardly-projecting V-shaped fixed pawl or tooth on said link adaptedto engage the teeth on said pulley when the link is released by said dogwhereby said clutch member is drawn into its clamping position by therearward revolution of the pulley and lifted out of its clampingposition by the forward revolution of the pulley.

24. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a dog adapted to holdsaid link normally upward; a trip for said dog; and a pawl on said linkadapted to engage the teeth on said pulley when the link is released bysaid dog whereby said clutch member is drawn into its clamping positionby the rearward revolution of the pulley and lifted out of its clampingosition by the forward revolution of the pulley.

25. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said'link; a dog adapted to hold said linknormally upward; a trip for said dog; and a forwardly-projectingV-shaped fixed pawl or tooth on said link adapted to engage the teeth onsaid pulley when the link is released by said dogwhereby said clutchmember is drawn into its clamping position by the rearward revolution ofthe pulley and lifted out of its clamping position by the forwardrevolution of the pulley.-

26. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said link; a dog adapted to hold said linknormally upward; a trip for said dog; and a pawl on said link adapted toengage the teeth on said pulley when the link is released by said dogwhereby said clutch member is drawn into its clamping position by therearward revolution of the pulley and lifted out of its clampingposition by the forward revolution of the pulley.

27. The combination with a frame, of a pulley having teeth thereon; amovablysupported clutch member arranged to coact with the pulley inclamping a rope; a pawl adapted to engage the teeth of said pulley; adog adapted to hold said pawl out of its engaging position; a trip forsaid dog adapted to be actuated by the load, said pawl being arranged toengage the teeth of said pulley when released by said dog, whereby onthe rearward movement of the pulley the clutch member is drawn into itsclamping position and moved therefrom by the forward movement of theulley and a spring arranged to normally ho d the pawl out of itsengaging position, the tension of the return spring being insufficientto release said clamping member when clamping a rope.

28. The combination with a frame, of a pulley having teeth thereon; amovable clutch member arranged to coact with the pulley in clamping arope; means for holding said clutch member yieldingly out of its engaging position; a pawl adapted to engage the teeth of said pulley;means actuated by the load for bringing said pawl into engagement withthe teeth of the said pulley, said pawl being adapted on the rearwardmovement of the pulley to draw the said clutch member into its clampingposition, and on the forward movement of the pulley to move said clutchmember from its clamping position when the load is discharged.

29. The combination with a frame of a pulley; a movably supported clutchmember arranged to coact with the pulley in clamping a rope; means forholding said clutch member yieldingly out of its engaging position;means for connecting said clutch member with said pulley arranged sothat on the rearward movement of the pulley, the clutch member is drawninto its clamping position, and on the forward movement of the pulley ismoved therefrom, said means for connecting said clutch member to saidpulley being brought into engaging position by the load and beingautomatically moved from its engaging position when the load isreleased.

30. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said link; a dog adapted to hold said linknormally upward; a trip for said dog adapted to be actuated by theweight of the load; a pawl on said link adapted to engage the teeth onsaid pulley when the link is released by said dog whereby said clutchmember is drawn into its clamping position by the rearward revolution ofthe pulley and lifted out of its clamping position by the forwardrevolution of the pulley; and a trip rope connected to said clutchmember.

31. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a dog adapted to holdsaid link normally upward; a trip for said dog; a forwardly-projectingV-shaped fixed pawl or tooth on said link adapted to engage the teeth onsaid pulley when the link is released by said dog, whereby said clutchmember is drawn into its clamping position by the rearward revolution ofthe pulley and lifted out of its clamping position by the forwardrevolution of the pulley; and a trip rope connected to said clutchmember.

32. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, pivotally mounted on said link; a dog adapted to holdsaid link normally upward; a trip for said dog; a pawl on said linkadapted to engage the teeth on said pulley when the link is released bysaid dog whereby said clutch member is drawn into its clamping positionby the rearward revolution of the pulley and lifted out of its clampingposition by the forward revolution of the pulley; and a trip ropeconnected to said clutch member.

33. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said link; a dog adapted to hold said linknormally upward; a trip for said dog; a forwardly-projecting V-shapedfixed pawl or tooth on said link adapted to engage the teeth on saidpulley when the link is released by said dog whereby said clutch memberis drawn into its clamping position by the rearward revolution of thepulley and lifted out of its clamping position by the forward revolutionof the pulley; and a trip rope connected to said clutch member.

34. The combination with a frame, of a pulley having teeth thereon; alink pivoted on said frame; a clutch adapted to coact with the pulley ingripping a rope, mounted on said link; a dog adapted to hold said linknormally upward; a trip for said dog; a pawl on said link adapted toengage the teeth on said pulley when the link is released by r said dogwhereby said clutch member is drawn into its clamping position by therearward revolution of the pulley and lifted out of its clampingposition by the forward revolution of the pulley; and a trip ropeconnected to said clutch member.

35. The combination with a frame, of a pulley having teeth thereon; amovablvsupported clutch member arranged to coact with the pulley inclamping a rope; a pawl adapted to engage the teeth of said pulley a dogadapted to hold said pawl out of its engaging position; a trip for saiddog adapted to be actuated by the load, said pawl being arranged toengage the teeth of said pulley when released by said dog, whereby onthe rearward movement of the pulley the cluteh member is drawn into itsclamping position and moved therefrom by the forward movement of thepulley and a spring arranged to normally hold the pawl out of itsengaging position the tension of the return spring being insufficient torelease said clamping member when clamping a rope; and a trip ropeconnected to said clutch member.

36. The combination with a frame of a pulley; a movably supported clutchmember arranged to coact with the pulley in clamping a rope; means forholding said clutch member yieldingly out of its engaging position;means for connecting said eluleh member with said pulley arranged sothat on the rearward movement of the pulley, the clutch member is drawninto its clamping position, and on the forward movement of the pulley ismoved therefrom, said means for connecting said clutch member to saidpulle being brought into engaging position by the load and beingautomatically moved from its engaging position when the load released,and a trip rope connected to said clutch member.

37. The combination with a frame, of a pulley having teeth thereon; amovable clutch member arranged to coact with the pulley in clamping arope; means for holding said clutch member yieldingly out of itsengaging position; a pawl adapted to engage the teeth of said pulley;means actuated by the load for bringing said pawl into engagement withthe teeth of said pulley, said. pawl being adapted on the rearwardmovement of the pulley to draw the said clutch member into its clampingposition, and on the forward movement of the pulley to move said clutchmember from its clamping position when the load is discharged; and atrip rope connected to said clutch member.

In witness whereof, I have hereunto set my hand and seal in the presenceof two witnesses.

LUELLA G. GREENFIELD, GERTRUDE TALLMAN.

